Mitochondrial toxins inhibit IL-4-induced expression of TTP. Microglial cells were treated with rotenone and stimulated with 10 ng/ml IL-4. After 4 hrs, 1 μg/ml LPS was added for 18 hrs and TTP expression was analysed by western blot. A representative blot is shown in (a). Quantification of western blots (b). Values are mean ± SEM for three to seven independent western blots.